F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
F25B 49/02 (2006.01) H02K 7/14 (2006.01) H02P 1/00 (2006.01)
Patent
CA 2603273
The present invention provides, in case of driving to control a motor for a refrigerant compressor by a sensorless system, a driving device that reduces vibrations and noises at starting, and realizes a smooth connection to the sensorless system. The driving device 22 includes a main inverter circuit 1 that applies quasi three-phase ac voltages to and drives the motor 21 for driving the refrigerant electric compressor forming a refrigerant circuit, current sensors 6V and 6W that detect the currents flown into the motor, and a control circuit 23 that executes driving and controlling by the sensorless system on the basis of the outputs from the current sensors. The control circuit applies predetermined starting currents that generate a rotational magnetic field to the motor and starts the motor, and after accelerating to a predetermined connecting frequency, shifts to driving and controlling by the sensorless system, and varies the starting currents and connecting frequency in accordance with a load of the compressor.
Kubo Mamoru
Nojima Kenji
Fetherstonhaugh & Co.
Sanyo Electric Co. Ltd.
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